Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 17, Problem 52Q
To determine
The approximate surface temperature of the star Zubeneschmali, which is of spectral type B8, and also determine its radius in comparison to the radius of the sun, if Zubeneschmali’s luminosity is about
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A star has a luminosity (power output) of 9.2x1026 W and a diameter of 6.1x108 m. What is its surface temperature? (Give your answer in SI units and include the units in your answer.)
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Chapter 17 Solutions
Universe
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- A G2 star has a luminosity 100 times that of the Sun. What kind of star is it? How does its radius compare with that of the Sun?arrow_forward15: A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the distance to this star? Answer: 37 16: What is the absolute magnitude of this star? Answer:1.8 17: Is this star more or less luminous than the Sun? Answer "M" for More luminous or "L" for Less luminous. (HINT: the absolute magnitude of the Sun is 4.8) Answer: M 18: What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.) Please answer question #18, #15-17 are correct, the photos provide the work for them.arrow_forwardIn the laboratory, the Balmer alpha line has a wavelength of 656.3 nm. If the line in a star’s spectrum appears at 655.8 nm, what is the star’s radial velocity? Is it approaching or receding? (c = 2.997 X 108 m/s)arrow_forward
- An astronomer is observing a binary star that is 15 pc away. The two stars have an orbital separation of 8.5 AU. If the astronomer is observing the binary star at a wavelength of 1200 nm, what is the minimum aperture of the telescope that is needed in order to resolve the two stars? D = marrow_forwardIf a T Tauri star is the same temperature as the Sun but is eighteen times more luminous, what is its radius relative to the Sun? (Hint: Use the luminosity-radius-temperature relation: L L = R R 2 T T 4 .) R R =arrow_forwardHow lumminous would a contracting prostar be relative to the sun if it is three times the radius of the sun and has a temperature of 1680 k? To the relationship, apply luminosity radius temperature. The sun's surface temperature is 5800k.arrow_forward
- The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is less than its laboratory value of 656.3 nm, one can conclude that... A. The separation between Earth and the star is decreasing. B. The separation between Earth and the star is increasing. C. The separation between Earth and the star is unchanging D. No conclusion is possible.arrow_forwardBefore the star that became SN 1987A exploded, it evolved from a red supergiant to a blue supergiant while remaining at the same luminosity. As a red supergiant, its surface temperature would have been approximately 4000 K, while as a blue supergiant, its surface temperature was 16,000 K. How much did the radius change as it evolved from a red to a blue supergiant?arrow_forward
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